“I haven’t really put pen to paper on it, but basically it goes back to the early expeditions of Pandora, and kind of what went wrong with the humans and the Na’vi and what that was like to be an explorer and living in that world,” Cameron said.

Thus, the fourth film would be a possible prequel, with potential for additional prequel features after that.

“We’ll start, not imitating ‘Star Wars,'” Cameron added, “but it’s a logical thing to do because we’ll have completed the thematic arc by the end of three.”

Before any of that, however, “Avatar 2″ has to get made. Cameron has previously stated the sequel probably won’t hit theaters until 2015, at the earliest. Fans still needing that trip to Pandora can pick up “Avatar” on Blu-ray 3D starting on Oct. 16.